diff --git a/src/agent0/hyperfuzz/fork_fuzz/accrue_interest_ezeth.py b/src/agent0/hyperfuzz/fork_fuzz/accrue_interest_ezeth.py
index 5871e6ab46..b432083a66 100644
--- a/src/agent0/hyperfuzz/fork_fuzz/accrue_interest_ezeth.py
+++ b/src/agent0/hyperfuzz/fork_fuzz/accrue_interest_ezeth.py
@@ -18,7 +18,18 @@
 DEPOSIT_QUEUE_ADDR = "0xf2F305D14DCD8aaef887E0428B3c9534795D0d60"
 
 
-def accrue_interest_ezeth(interface: HyperdriveReadWriteInterface, variable_rate: FixedPoint):
+def accrue_interest_ezeth(interface: HyperdriveReadWriteInterface, variable_rate: FixedPoint) -> None:
+    """
+    Function to accrue interest in the ezeth pool when fork fuzzing.
+
+    Arguments
+    ---------
+    interface: HyperdriveReadWriteInterface
+        The interface to the Hyperdrive pool.
+    variable_rate: FixedPoint
+        The variable rate of the pool.
+    """
+
     assert variable_rate > FixedPoint(0)
 
     # TODO we may want to build these objects once and store them
diff --git a/src/agent0/hyperfuzz/fork_fuzz/accrue_interest_fork.py b/src/agent0/hyperfuzz/fork_fuzz/accrue_interest_fork.py
index 613b5cecf1..72c357c3b2 100644
--- a/src/agent0/hyperfuzz/fork_fuzz/accrue_interest_fork.py
+++ b/src/agent0/hyperfuzz/fork_fuzz/accrue_interest_fork.py
@@ -7,7 +7,19 @@
 from .accrue_interest_ezeth import accrue_interest_ezeth
 
 
-def accrue_interest_fork(interface: HyperdriveReadWriteInterface, variable_rate: FixedPoint):
+def accrue_interest_fork(interface: HyperdriveReadWriteInterface, variable_rate: FixedPoint) -> None:
+    """Function to accrue interest in underlying yields when fork fuzzing.
+    This function looks at the kind of pool defined in the interface, and
+    matches the correct accrual function to call.
+
+    Arguments
+    ---------
+    interface: HyperdriveReadWriteInterface
+        The interface to the Hyperdrive pool.
+    variable_rate: FixedPoint
+        The variable rate of the pool.
+    """
+
     # Switch case for pool types for interest accrual
     # TODO do we need to switch chain?
     hyperdrive_kind = interface.hyperdrive_kind